Scale-poise



J. R. JACKSON.

SCALE POISE. APPLICATION FILED JUNE 2. |911. RENEwED Nov. 8. 1918.

1,307,818. Patented June 24,1919.

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INYEN'LOR J Ii] gm m32 il l m/ y UNITED sTATEs A PATENT oEEioE.

JAMES R. JACKSON, 0F OAKLAND, CALIFORNIA, ASSIGNOR OF ONE-HALF TO ROY MAUVAIS, OF SAN FRANCISCO, CALIFORNIA.

scALE-BoIsE.

Speccation of Letters Patent.

Patented June 24, 1919.

Application med .Tune 2, 1917, serial No. 172,415. Renewed November s, 191s. senai No. 261,714.

To all 707mm it may concern:

Be it lknown that I, JAMES R. JACKSON, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improven'ients in Scale-Poises, of which the following is a specification.

This invention relates to a scale poise.

One of the objects of the present invention is to provide a simple, substantial, cheaply manufactured poise and balance hall for scale beams, which are more sensitive in action and which are adapted to be locked to the beam when adjusted, thereby preventing employees or unauthorized persons from tampering with the scale or putting it out of adjustment accidentally, maliciously, or otherwise. Further objectswill hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described rand claimed, having reference to the accompanying drawings, in which- Figure 1 is a perspective view of the beam on the scale, showing the application of the invention.

Fig. 2 is an end view of the poise and the beam. l

Fig. 8 is a central, longitudinal section through the poise and beam, showing the application of the key-actuated locking mechanism.

Fig. 4 is a longitudinal section through the balance ball, showing the application of the locking mechanism.

Fig. 5 is a. cross section on line 5-5 of Fig'. 4.

Referring to the drawings in detail, A indicates the beam, having the usual sliding poise, of a standard form of scale, 2 the knife bearing rest on which the beam is supported, 3 the pillar, t the steelyard rod and loop, 5 the beam rack, 6 the poise and 7 the balance ball. The construction of the poise 6 and the balance ball 7 forms the'main subject-matter of the present invention and will be as follows:

Referring to Figs. 2 and 3, it will be seen that the greater body portion of the weight or poise is positioned above the beam, as indicated at 8, while t-he lower portion 9 merely forms a guide to support it upon the beam. The location of the weight above the beam is of considerable importance for the reason that it renders the beam more sensitive and active than is otherwise the case. The lock employed in this instance is a standard type of Yale lock and consists of a housing 10 which is suitably secured in the end of the beam A. Mounted interiorly of the housing 10 is a barrel 11 adapted to receive the key in the usual manner.

The inner end of the barrel extends through the casing of the lock and has secured thereon a cam member 12, which is adapted to be moved into and out of register with notches 13 formed in the sides of the poise. The notches are preferably V- shaped and the face of the cam is similarly shaped to take up wear and also to reduce any tendency of play when in interlocking position. The poise, when once applied and locked in position, cannot, therefore, be moved, displaced or tampered with as it is first necessary to insert a key and turn the barrel to a position where the cam is out of engagement with the notches 13 before the poise can be removed.

The locking mechanism employed in connection with the balance ball 7 consists of the following parts: Mounted interiorly of the ball, in a recess formed therefor, is a clamping block 14. This block is set into the recess when ball is threaded and the threads formed therein will, therefore, c-oincide or form a continuation of the threads extending from end to end of the ball. Formed exteriorly of the ball is an annular groove 15, in which is turnably mounted a ring 16. This ring is provided with a recess for the reception of a spring-actuated locking pin 17 and is also provided with an opening 18 which is adapted to be turned into and out of register with a set-screw 19, which is provided for the purpose of releasing or moving the clamping block into engagement with the threaded rod extension 2O of the beam.

Formed in one end of the balance ball proper is a slot or opening 21, which is formed for the reception of a key 22 and also for the reception of the locking pin 17. The forward end of the key employed is wedged-shaped, as at 23, and as the inner end of the locking pin is also wedge-shaped, as shown at 24, it can readily be seen that the insertion of the key will force the pin out of engagement with the slot 21, thereby permitting the ring 16 to be turned until vI claim. and Adesire to the opening comes yinto register with the setscrew 19. This may 'then be released by means of a screw driver andthe poise 'as a whole may be turned uponthe threads of the rod`20 until a proper adjustment has been made. rPhe screw is then reset to'lock the poise or to force the clamp 14E into engagement with the'threads.

fremove the .poise or re-adjust the 'balance ball. -Unbalancing of .the scale` accidentally, maliclously, or otherwise is 1n this manner prevented. anda more sensitive and active beam action is permitted,asthenrajo-r portioirof-the weight contained inthepoise is positioned above the beam.

While two liormsof blocks arehere shown, it is obvious that I do not wishtolimit-myself `,to-.either specific structure shown .as

practicallyiany form of key-actuated lock might be employed. Also, 1 wishitfunderstood lthat 4the materialsandnish of -:the severalparts of the device maybe such as the experience,andljudgmentof the manufacturer may dictate.

Having: thus: described my i'nventiomwhat secureby `Letters Patent lsl. Thewcombinationiwith a scale beam,.of

a poise mounted on the end of the beam, and

Ahaving notches formed therein a cam member carried by the beam, and a key-actuated locklad'apted'toturn the cam into and out of Yregister with said notches formed in t-he poise.

'2. In combination with a scale beam, a poisemounted thereon, a key actuatedlock having a movable barrel carried by one of said two first named elements, and interengaging means between the'barrel and one Vo ffsaid-two irstnamed elements for locking the )poise to 'the beam.

3. .In combinationwithI a scale beam,'hav inrgeanaopening extendingthrough Aan end ,thereoi la key 1 actu-atedy lock mounted in said Opening so asftoen'able-thekey to enter the lockrom said endof the fbeam, a poise on Ithe beam, and means .operable by the lockfmovements'for locking the poise to the beam.

.4.111 combination with ka scale beam, a ,poise'mountedthereom a key actuated lock borne? byoneof, said elements, and interen- `gagingn-ieansbetween.the lock and one of the-twov said irstnamedzelements for locking the poisefon tthe r beam.

5. ln :combination with a `scale-beam, a poise mounted thereon and formed with a weighted enlarged head at its upper end [located above. the .beam and having a lower part' for"supportingthe.poise on the beam, and means. cooperating .withtthe lower ypart of the poise to lock the latterto the beam. .InV testimony VWhereofl have hereunto set my hand :iin the .presence olf-'two subscribing witnesses.

i tl-'AMES iRpJACKSGN.

Witnesses: i

, jeIDA H.MAUv-A1s,

MACMEEKIN.

Copies. of this :patent maybeobtainedor.five-cents ea'ch,r.'py addressing.the fcommissioner.of IPatents,

Washington, ma C. Y 

